package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

/**
 * @author 刘宇
 */
@Service
public class SetmealServiceImpl implements SetmealService {
    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private DishMapper dishMapper;
    /**
     * 新增套餐
     * @param setmealDTO
     */
    @Override
    @Transactional
    public void saveWithDish(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        //向套餐表中插入数据
        setmealMapper.insert(setmeal);
        //获取套餐生成的id
        Long setmealId=setmeal.getId();
        //为套餐中的每个数据设置套餐关联id
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        for (SetmealDish setmealDish : setmealDishes) {
            setmealDish.setSetmealId(setmealId);
        }
        //需要保证套餐和菜品的关联数据
        setmealDishMapper.insertBatch(setmealDishes);
    }

    /**
     * 套餐分页查询
     * @param setmealPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        //开启分页查询
        PageHelper.startPage(setmealPageQueryDTO.getPage(),setmealPageQueryDTO.getPageSize());
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);
        //封装返回值
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 批量删除套餐
     * @param ids
     * @return
     */
    @Override
    public void deleteBatch(List<Long> ids) {
        for(Long id:ids){
            Setmeal setmeal = setmealMapper.getById(id);
            if(setmeal.getStatus()== StatusConstant.ENABLE){
                //起售中的套餐不能删除
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
            //删除套餐表中的数据
            setmealMapper.deleteById(id);
            //删除套餐菜品关系表中的数据
            setmealDishMapper.deleteBySetmealId(id);
        }
    }

    /**
     * 根据id查询套餐，用于修改页面回显数据
     * @param id
     * @return
     */
    @Override
    public SetmealVO getByIdWithDish(Long id) {
        //根据id获得套餐
        Setmeal setmeal = setmealMapper.getById(id);
        //获得套餐和菜品的关联关系
        List<SetmealDish> setmealDishes = setmealDishMapper.getBySetmealId(id);
        //封装返回值
        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal,setmealVO);
        setmealVO.setSetmealDishes(setmealDishes);
        return setmealVO;
    }

    /**
     * 修改套餐
     * @param setmealDTO
     */
    @Transactional
    @Override
    public void update(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);

        //1、修改套餐表，删除原有 然后新增
        setmealMapper.update(setmeal);
        //套餐id
        //删除原有的菜品套餐关联关系
        Long setmealId = setmealDTO.getId();
        setmealDishMapper.deleteBySetmealId(setmealId);
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        for (SetmealDish setmealDish : setmealDishes) {
            setmealDish.setSetmealId(setmealId);
        }
        //重新插入关系
        setmealDishMapper.insertBatch(setmealDishes);
    }

    /**
     * 套餐起售、停售
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        //起售套餐时,需要判断套餐中是否存在停售的菜品
        if(status == StatusConstant.ENABLE) {
            //select a.* from dish a left join setmeal_dish b on a.id = b.dish_id where b.setmeal_id = ?
            List<Dish> dishList = dishMapper.getBySetmealId(id);
            if(dishList != null && dishList.size() > 0){
                dishList.forEach(dish -> {
                    if(StatusConstant.DISABLE == dish.getStatus()){
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }
        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setmealMapper.update(setmeal);
    }
    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询菜品选项
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }
}
